This article is taken from: "Communication Technology" 1 Introduction Seven Signaling System is one of the key technologies of modern communication network, is a neural center of communication network, in communication networks such as telephone network, mobile network, intelligent network, have become an indispensable part of the communication network. . As the nerve center of modern network communication, the role played in mobile communications is also increasing, and the requirements for the management and maintenance of the seven credit networks are getting higher and higher. How to better monitor the seven signaling network, improve the quality of operation service and operation and maintenance, improve telephone turnover, monitor certain exception calls, and become a problem that telecom operators urgently need to solve. The maintenance requirements of the increasingly complex and large-scale SMS networks are not satisfied with the maintenance requirements of the traditional network management system, monitoring instruments. Seventh Signaling Concentration Detection System can accurately and effectively access signaling information, providing effective support for signaling network management and maintenance, business quality monitoring and analysis. 2 GSM Digital Mobile System Monitor Interface and Protocol Model GSM Digital Mobile System consists of four parts: mobile station (MS), base station subsystem (BSS), network, and exchange subsystem (NSS), operation maintenance subsystem (OSS), etc. . The base station subsystem (BSS) consists of two types of equipment of the base station transceiver (BTS) and the base station controller (BSC). Network and Exchange Subsystem (NSS) include a mobile switching center (MSC), a visitor location register (VLR), a home location register (HLR), a monitoring center (AUC), MSC gateway (GMSC) and other functional parts. The UM interface is an air radio interface that is a communication interface between the mobile station and the base station transceiver (BTS), and the signaling transmission protocol is a GSM unique LAPDM. The ABIS interface is a communication interface between the base station subsystem, ie the communication interface between the base station controller (BSC) and the base station transceiver (BTS), and the signaling transmission protocol is LAPD. The interface between the BSS and the mobile service switching center MSC is an interface, and the A interface is based on the 2Mbit / s digital interface, and the 14-bit encoded No.7 signaling method is used. Main transmission includes call processing, mobility management, base station management, mobile station management, etc. The interface between the MSC and the Visit Position Register VLR is a B interface, which is used for the MSC to ask the VLR about the current location information about the mobile station, or inform the VLR to update information about the location of the mobile station. The interface between the MSC and the home position register HLR is a C interface for completing the passage of the called mobile customer information and the roaming number of the called mobile customer. The D interface is an interface between HLR and VLR, mainly swaps location information and customer information. The interface between the MSC is an E-interface. It is a 2Mbit / s digital interface that uses 24-bit encoded No.7 signaling mode, and the bit is kept continuous, while switching. 3 Monitoring system architecture and functional requirements * Architecture seven signaling centralized monitoring systems use modular architectural structures, mainly divided into center and remote station, which are interconnected between the WAN (WAN). The central station and the remote station are constructed from their respective local LAN (LAN), and the client / server mode is used, and the system can be flexibly constructed and expanded according to the user's network needs. The data is collected from the seven trunk link 2Mbit / s, and then generates the corresponding data and call detailed record (CDR) to generate the corresponding data and call detail record (CDR) to the remote station after pretreatment. Database; * Features requires a platform for seven signaling centralized monitoring systems as a network maintenance optimized platform should have a certain function, mainly including real-time application parts and integrated statistical analysis. 3.1 Real-Time Applications 3.1.1 Real-time monitoring and management system for signaling links provides real-time monitoring of inter-network signaling link status and load to display the system in real time in real time. Various link faults, and reflect the type and level of the alarm by color change. At the same time, the available status and load of the signaling link can be displayed in real time, and the link loads within a certain time can be queried, statistically, sorted, providing various charts to analyze the link performance, providing technology for network optimization in accordance with.
3.1.2 Message Filtering Filter Decision Which events are stored, allowing users to query signaling messages with special content. Use sequence filtration to form a complete sequence of event processing. Event recognition and sequence identification can be selected as a filter for the filter, and the user can select multiple events and sequence identification. 3.1.3 Busy Number Guan Management System Real Time Detects and provides a busy household number, busy, user-related information, this information allows business departments such as telephone marketing to solve the user's busy and low-leading The problem. Through a targeted mobile management, it will greatly improve long-distance and local network phone turnout, and improve service quality. 3.1.4 Call Tracking Function The full signaling process of a call is real-time, in order to quickly determine the case of signaling cooperation between each entity, where the specified call number tracking test function is implemented to ISDN Dynamic real-time tracking of numbers, mobile users IMSI, MSISDN number; system should automatically track and specify signaling cooperation related to calls, real-time display of tracking messages or calling process records, quickly query the cause of call failure, user business reasons, user location environment Wait. The system also has the ability to track multiple user numbers, automatically track multi-segment, multi-protocol signaling process, saving tracking process data. 3.1.5 Protocol Analysis Capability Seven Signaling Concentration Monitoring Systems have a fully decoded and protocol analysis of MTP, TUP, ISUP, MAP, etc. This feature can make the inter-office signaling analysis very convenient and rapid, and the maintenance personnel can be worn by the protocol of any link in the network to facilitate the compatibility test between various switches and new services such as ISDN and intelligent networks. Problem search and solve. 3.2 Integrated Statistical Analysis Some Composite Statistical Analysis Part Two-level data mining and statistics on the data stored in the database, and reflected by reports, histograms, pie charts, graphs, etc. Provide effective decision support data for network management, business management, network planning, etc. These include: 3.2.1 Fault Analysis Fault Analysis is a detailed statistical statistical statistical statistics on the fault frequency and lattice of the link, link group, route group, subsystem, etc., as well as lateral and longitudinal comparisons. For alarm records and queries, support flexible query conditions: avelatable type, alarm level, alarm time, clear time, alarm source, etc. 3.3.2 Statistical Analysis of Network Performance The statistical analysis of link performance refers to a comprehensive statistical analysis of its performance indicators within the specified link, then specified. The analysis content includes: --- The integrity of the signaling link (the failure rate, the congestion time is too long, the block is too long, etc.) ---- the availability of signaling links (unavailable time, blocking time) ---- The utilization rate of signaling links (the number of MSUs, the number of link congestions, etc.) ---- Signaling Link MTP bearer performance (MTP carries TUP, ISUP, INAP, MAP, etc. Load) 3.2.3 Statistical analysis of signaling routing performance is composed of different signaling link groups, and the performance of signaling routing is obtained by performance statistical analysis of each link group. Analysis content includes: --- Unavailable Duration of Signaling Link Group ---- Signaling Link Group Failure ----- to a certain or set of DPC routing groups unavailable events Number ---- To a certain or a set of DPC routing groups unavailable time 3.2.4 Signaling point (STP / SP) statistical analysis signaling point performance statistical analysis refers to the specified signaling point ( STP / SP), integrated statistical analysis of its performance indicators within the specified time range. The analysis content includes: --- The accessibility of signaling points (the number of signaling points, the number of unacceptable time, etc.) ---- The load status of the signaling point (the number of MSUs, the matching STP Situation of load imbalance differences, etc.) --- Service processing capabilities of signaling points (the number of TUP / iUUP / INAP / MAP, etc.) 3.2.5 Signaling services (TUP, ISUP, SCCP, etc. ) And its corresponding call statistical signaling services (TUP, ISUP, SCCP, etc.) and their corresponding call statistical analysis include: number of call times, turn-on, number of times, answers, call duration, call loss distribution, super Short call number and number of times of long calls, etc.
